Waver

Wavers were part of the army that was laying siege to the Palace of Power when Kevin Keene arrived in Videoland. When Princess Lana got kidnapped by Mother Brain, she found herself in the underground corridors of Metroid with Kevin and Duke when they came to rescue her. After escaping the Skrees and traversing some moving platforms, they were attacked by two Wavers, both of which Kevin blasted with his Zapper.